MD Settings: Add "Auto Open" setting to Downloads C++ handler.

chrome/browser/ui/webui/settings/downloads_handler.cc

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/settings/downloads_handler.h"
 
 #include "base/values.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/chrome_select_file_policy.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/prefs/pref_service.h"
 #include "components/prefs/scoped_user_pref_update.h"
+#include "content/public/browser/download_manager.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "ui/base/l10n/l10n_util.h"
 
 using base::UserMetricsAction;
 
 namespace settings {
 
-DownloadsHandler::DownloadsHandler() {
-}
+DownloadsHandler::DownloadsHandler(Profile* profile) : profile_(profile) {}
 
 DownloadsHandler::~DownloadsHandler() {
   // There may be pending file dialogs, we need to tell them that we've gone
   // away so they don't try and call back to us.
   if (select_folder_dialog_.get())
     select_folder_dialog_->ListenerDestroyed();
 }
 
 void DownloadsHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback(
+      "initializeDownloads",
+      base::Bind(&DownloadsHandler::HandleInitialize, base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(
       "selectDownloadLocation",
       base::Bind(&DownloadsHandler::HandleSelectDownloadLocation,
                  base::Unretained(this)));
 }
 
+void DownloadsHandler::OnJavascriptAllowed() {
+  PrefService* prefs = profile_->GetPrefs();
+  pref_registrar_.Init(prefs);

[Dan Beam, 2017/02/23 03:06:32]

nit: pref_register_.Init(profile_->GetPrefs())

[tommycli, 2017/02/24 19:02:41]

Done.

+
+  pref_registrar_.Add(
+      prefs::kDownloadExtensionsToOpen,
+      base::Bind(&DownloadsHandler::SendAutoOpenDownloadsToJavascript,
+                 base::Unretained(this)));
+}
+
+void DownloadsHandler::OnJavascriptDisallowed() {
+  pref_registrar_.RemoveAll();
+}
+
+void DownloadsHandler::HandleInitialize(const base::ListValue* args) {
+  AllowJavascript();
+  SendAutoOpenDownloadsToJavascript();
+}
+
+void DownloadsHandler::SendAutoOpenDownloadsToJavascript() {
+  content::DownloadManager* manager =
+      content::BrowserContext::GetDownloadManager(profile_);
+  bool auto_open_downloads =
+      manager && DownloadPrefs::FromDownloadManager(manager)->IsAutoOpenUsed();
+  CallJavascriptFunction("cr.webUIListenerCallback",
+                         base::StringValue("auto-open-downloads-changed"),
+                         base::FundamentalValue(auto_open_downloads));
+}
+
 void DownloadsHandler::HandleSelectDownloadLocation(
     const base::ListValue* args) {
-  PrefService* pref_service = Profile::FromWebUI(web_ui())->GetPrefs();
+  PrefService* pref_service = profile_->GetPrefs();
   select_folder_dialog_ = ui::SelectFileDialog::Create(
       this, new ChromeSelectFilePolicy(web_ui()->GetWebContents()));
   ui::SelectFileDialog::FileTypeInfo info;
   info.allowed_paths = ui::SelectFileDialog::FileTypeInfo::NATIVE_OR_DRIVE_PATH;
   select_folder_dialog_->SelectFile(
       ui::SelectFileDialog::SELECT_FOLDER,
       l10n_util::GetStringUTF16(IDS_SETTINGS_DOWNLOAD_LOCATION),
       pref_service->GetFilePath(prefs::kDownloadDefaultDirectory), &info, 0,
       base::FilePath::StringType(),
       web_ui()->GetWebContents()->GetTopLevelNativeWindow(), NULL);
 }
 
 void DownloadsHandler::FileSelected(const base::FilePath& path,
                                     int index,
                                     void* params) {
   content::RecordAction(UserMetricsAction("Options_SetDownloadDirectory"));
-  PrefService* pref_service = Profile::FromWebUI(web_ui())->GetPrefs();
+  PrefService* pref_service = profile_->GetPrefs();
   pref_service->SetFilePath(prefs::kDownloadDefaultDirectory, path);
   pref_service->SetFilePath(prefs::kSaveFileDefaultDirectory, path);
 }
 
 }  // namespace settings